网球式的单层包装将圆柱体塞满是最简单的；
The tennis ball-style single stack of balls in a tight-fitting cylinder is the simplest;
通过一个圆柱式连接器，Arduino 能够接受一定电压范围内的电源（有关更多细节，请参阅 参考资料）。
Through a barrel connector, the Arduino can accept power at a range of different voltages (see Resources for details).
这种装置叫做“便携式通用轻型堵漏包”（其英文缩略语为PLUG，正好有塞子的意思）。 它是由聚酯纤维和聚氯乙烯制作的圆柱形气球，并安装了发动机带动的水泵。
The Portable Lightweight Ubiquitous Gasket (PLUG) is a sausage-shaped balloon made of polyester and PVC, and fitted with motorised pumps.
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